catharsis (n.) Look up catharsis at Dictionary.com
1803, "bodily purging," from Latinized form of Greek katharsis "purging, cleansing," from stem of kathairein "to purify, purge," from katharos "pure, clear of dirt, clean, spotless; open, free; clear of shame or guilt; purified" (with most of the extended senses now found in Modern English clear, clean, pure), of unknown origin. Originally medical in English; of emotions from 1872; psychotherapy sense first recorded 1909, in Brill's translation of Freud.